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psycopg2 is a PostgreSQL database adapter for the Python programming language. It was written from scratch with the aim of being small, fast and stable. It supports the full Python DBAPI-2.0 and is thread safe. psycopg2 is different from the other database adapter because it was designed for heavily multi-threaded applications that create and destroy lots of cursors and make a conspicuous number of concurrent INSERTs or UPDATEs. Every open Python connection keeps a pool of real (UNIX or TCP/IP) connections to the database. Every time a new cursor is created, a new connection does not need to be opened; instead one of the unused connections from the pool is used. That makes psycopg very fast in typical client-server applications that create a servicing thread every time a client request arrives. See also: https://github.com/psycopg/psycopg2